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I think you should start by the word I "believe"
Then you mention the value that you gonna add to the institution
and finally the benefit thats will came after hiring you.
For example:
"I believe that I can work on you system to make it ten times faster, that will low the cost on you and make you able to deal with more clients".
There is no best answer, it will be different depending based on the interview itself and how it goes.
because I have good experience in cust service for the cashier and foodserver it's like a merchandiser it's different product but impotant how to connect to the cust and good smile is the no. 1 u need if you need to make sales.